root@6f254745382a:/app# bundle exec derailed exec perf:stackprof
Booting: production
Endpoint: "/"
/usr/local/bundle/gems/derailed_benchmarks-1.3.4/lib/derailed_benchmarks/tasks.rb:86: warning: already initialized constant DERAILED_APP
/usr/local/bundle/gems/derailed_benchmarks-1.3.4/lib/derailed_benchmarks/tasks.rb:23: warning: previous definition of DERAILED_APP was here
/usr/local/bundle/gems/derailed_benchmarks-1.3.4/lib/derailed_benchmarks/tasks.rb:137: warning: already initialized constant TEST_COUNT
/usr/local/bundle/gems/derailed_benchmarks-1.3.4/lib/derailed_benchmarks/tasks.rb:66: warning: previous definition of TEST_COUNT was here
       user     system      total        real
100 requests  1.090000   0.080000   1.190000 (  1.226004)
Running `stackprof tmp/2018-07-20T07:43:23+00:00-stackprof-cpu-myapp.dump`. Execute `stackprof --help` for more info
==================================
  Mode: cpu(1000)
  Samples: 1161 (0.26% miss rate)
  GC: 138 (11.89%)
==================================
     TOTAL    (pct)     SAMPLES    (pct)     FRAME
       138  (11.9%)         138  (11.9%)     (garbage collection)
        38   (3.3%)          38   (3.3%)     Concurrent::Collection::NonConcurrentMapBackend#[]
        36   (3.1%)          36   (3.1%)     Logger::Formatter#format_datetime
        32   (2.8%)          32   (2.8%)     ActiveSupport::SafeBuffer#initialize
        30   (2.6%)          18   (1.6%)     Logger::LogDevice#write
        31   (2.7%)          18   (1.6%)     ActiveSupport::SafeBuffer#safe_concat
        18   (1.6%)          18   (1.6%)     IO#read_nonblock
        16   (1.4%)          16   (1.4%)     IO#write_nonblock
        17   (1.5%)          16   (1.4%)     ActionView::Helpers::TagHelper::TagBuilder#tag_option
        54   (4.7%)          15   (1.3%)     Logger::Formatter#call
        15   (1.3%)          15   (1.3%)     ActiveSupport::SafeBuffer#html_safe?
        14   (1.2%)          14   (1.2%)     Nokogiri::XML::Document#initialize
        14   (1.2%)          14   (1.2%)     ActiveSupport::PerThreadRegistry#instance
        11   (0.9%)          11   (0.9%)     block (2 levels) in url_helpers
        11   (0.9%)          11   (0.9%)     ActiveSupport::Notifications::Event#initialize
        13   (1.1%)          10   (0.9%)     ActionController::UrlFor#url_options
        10   (0.9%)          10   (0.9%)     Rack::Request::Env#get_header
        11   (0.9%)          10   (0.9%)     Nokogiri::XML::Node#write_to
        27   (2.3%)           9   (0.8%)     Redis::Connection::SocketMixin#_read_from_socket
         9   (0.8%)           9   (0.8%)     ActionDispatch::Journey::Format#evaluate
         9   (0.8%)           9   (0.8%)     ActionView::PartialRenderer#retrieve_variable
         9   (0.8%)           9   (0.8%)     block (4 levels) in class_attribute
        10   (0.9%)           9   (0.8%)     ActionView::LogSubscriber#from_rails_root
        20   (1.7%)           8   (0.7%)     ActionDispatch::Journey::GTG::Builder#transition_table
         8   (0.7%)           8   (0.7%)     Set#include?
         9   (0.8%)           8   (0.7%)     block (2 levels) in class_attribute
         7   (0.6%)           7   (0.6%)     MonitorMixin#mon_enter
         7   (0.6%)           7   (0.6%)     ActiveSupport::Configurable#config
         6   (0.5%)           6   (0.5%)     MonitorMixin#mon_enter
       661  (56.9%)           6   (0.5%)     ActionView::AbstractRenderer#instrument